AC Resonance Phase and Current – Rankers Physics
Topic: Alternating Current
Subtopic: LR, RC and LCR Circuits

AC Resonance Phase and Current

Assertion (A): At resonance in AC circuits current and emf are in phase.
Reason (R): At resonance in AC circuits, current is maximum.
 
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution:

At resonance, the inductive reactance \(X_L\) equals the capacitive reactance \(X_C\), making the total impedance purely resistive \(Z=R\). This results in the current and emf being in phase. Since impedance is minimal \(Z=R\), the current is maximal. Therefore, R is the correct explanation of A.

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